Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.
4
3
2
1
Correct answer is C
C2H2 + yH2 → C2H6
To balance the equation, we must have 2 carbon atoms on both sides and 6 hydrogen atoms.
On the LHS and RHS, carbon = 2 atoms.
On the LHS, Hydrogen = 2 + 2y.
On the RHS, Hydrogen = 6.
⇒ 2 + 2y = 6
2y = 4
y = 2.
Which of the following statements about nuclear reaction is correct? The reaction
involves neutrons only
takes place inside the nucleus
is governed by temperature and pressure
involves protons and electrons only
Correct answer is B
A nuclear reaction is semantically considered to be the process in which two nuclei, or a nucleus and an external subatomic particle, collide to produce one or more new nuclides.
Noble gas molecules are held together by
van der Waals forces
hydrogen bonds
dative bonds
covalent bonds
Correct answer is A
No explanation has been provided for this answer.
Which of the following elements is diatomic?
Sodium
Oxygen
Iron
Neon
Correct answer is B
The seven diatomic elements are Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Iodine, Bromine.
The bonds in crystalline ammonium chloride are
covalent and dative
ionic and covalent
ionic, covalent and dative
ionic, covalent and hydrogen bond
Correct answer is C
N makes three covalent bonds with three Hydrogen and a coordinate (dative covalent) bond with with hydrogen ion, forming ammonium ion (NH+4. The ammonium ion forms an ionic bond with chloride ion to form NH4Cl.